Boy on carpet with lamp

Hi there, I'm hoping to find a rewire-able lamp holder size E12 or E14 to meet with NZ standards as well as the actual brass fitting that held up the lampshade.
If anyone can help or suggest where I can get these I would be extremely grateful.
This lamp is the only possession I have of my late grandmother and when items arrived from S.Africa, the fitting holding up the lampshade was missing!! They must have thrown it out not realising it was part of something. I wanted to rewire the lamp as the cord is very old but need the rewire-able lamp holder. I have searched for the number stamped on the underside to no avail.